audio to midi? It's done! - No, I doubt that!
Stephan M. Sprenger
sms at prosoniq.com
Wed Dec 2 14:24:48 EST 1998
Daniel Schmitt wrote:
> Michal Jurewicz wrote:
> > I was wondering if there is any software out there that would convert audio
> > (let's say pcm) to midi. In other words: if I can record a real piano...
> > [snipped by Daniel]
> This is a real-time conversion.
> We just started a free beta programm for our product Inst2midi.
> It's a audio to midi real-time conversion program for SGI platform.
> (Windows is anticipated next year.)
Are you really talking about polyphonic audio to MIDI conversion for
_polytimbral_ music? I don't find any polyphonic polytimbral examples on
your web site. I see on your web site either monophonic lines, which are
fairly easy to transcribe (even if they do not have a prominent
fundamental frequency they can be easily tracked by short time
autocorrelation or AMDF methods) and the piano.mid polyphonic
monotimbral example. For monophonic pitch to MIDI, as far as I remember
Roland did this back in the 80s (anyone remember the name of that 19"
rack unit, something with a '70' in the name, 'VP-70' maybe?), and
probably someone else came up with a box to do this even earlier.
> You will find there a lot of examples of the converted midi file and the
> orginal audio file.
> Every comment is welcome.
The one example of polyphonic monotimbral pitch to MIDI conversion goes
in the right direction, but it still seems too unstable to work with an
arbitary audio file (false triggerings are still too frequent and time
resolution seems to be too coarse, ie. some events appear 'quantized' to
the same frame). I'll compare it with what I did based on sinusoidal
modeling back then on the SGI myself (I need to dig in my files that
have been sitting there for almost seven years now) and I'll make the
result available if anyone is interested and if you would allow me to
use your piano.aiff audio file.
Stephan M. Sprenger
Director, R&D http://www.prosoniq.com
PROSONIQ PRODUCTS SOFTWARE http://www.sonicworx.com
More information about the music-dsp